diff --git a/packages/google-cloud-asset/src/v1/asset_service_client.ts b/packages/google-cloud-asset/src/v1/asset_service_client.ts
index 88fb9bab153f..b70e9b62431a 100644
--- a/packages/google-cloud-asset/src/v1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1/asset_service_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class AssetServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class AssetServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class AssetServiceClient {
     const staticMembers = this.constructor as typeof AssetServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -241,6 +246,9 @@ export class AssetServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -269,7 +277,8 @@ export class AssetServiceClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.asset.v1.AssetService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
index f59a2a7d72d1..a749e2e655db 100644
--- a/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p1beta1/asset_service_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class AssetServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class AssetServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   assetServiceStub?: Promise<{[name: string]: Function}>;
 
@@ -101,6 +103,9 @@ export class AssetServiceClient {
     const staticMembers = this.constructor as typeof AssetServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -176,6 +181,9 @@ export class AssetServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -204,7 +212,8 @@ export class AssetServiceClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.asset.v1p1beta1.AssetService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
index 8416b8a92312..f3e6ca6b1a22 100644
--- a/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p2beta1/asset_service_client.ts
@@ -39,6 +39,7 @@ const version = require('../../../package.json').version;
 export class AssetServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -50,6 +51,7 @@ export class AssetServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   assetServiceStub?: Promise<{[name: string]: Function}>;
@@ -93,6 +95,9 @@ export class AssetServiceClient {
     const staticMembers = this.constructor as typeof AssetServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -167,6 +172,9 @@ export class AssetServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -195,7 +203,8 @@ export class AssetServiceClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.asset.v1p2beta1.AssetService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
index 6ee2ff6b7352..e9741134f50a 100644
--- a/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p4beta1/asset_service_client.ts
@@ -45,6 +45,7 @@ const version = require('../../../package.json').version;
 export class AssetServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -56,6 +57,7 @@ export class AssetServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   operationsClient: gax.OperationsClient;
   assetServiceStub?: Promise<{[name: string]: Function}>;
@@ -99,6 +101,9 @@ export class AssetServiceClient {
     const staticMembers = this.constructor as typeof AssetServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -189,6 +194,9 @@ export class AssetServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -217,7 +225,8 @@ export class AssetServiceClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.asset.v1p4beta1.AssetService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts b/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
index ada5ebb2f720..117005ceef5d 100644
--- a/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
+++ b/packages/google-cloud-asset/src/v1p5beta1/asset_service_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class AssetServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class AssetServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   assetServiceStub?: Promise<{[name: string]: Function}>;
 
@@ -101,6 +103,9 @@ export class AssetServiceClient {
     const staticMembers = this.constructor as typeof AssetServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -171,6 +176,9 @@ export class AssetServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -199,7 +207,8 @@ export class AssetServiceClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.asset.v1p5beta1.AssetService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides